Mode filter with refractive index modification
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United States of America Patent
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Jun 7, 2016
Grant Date -
Dec 11, 2014
app pub date -
Sep 27, 2012
filing date -
Sep 30, 2011
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Abstract
The invention relates to a mode filter for reducing higher-order modes, with an optical fiber (1), which has a core (2) and a cladding (3) surrounding the latter, wherein the cladding (3) and core (2) have refractive indices that differ from one another. In order to develop an alternative to the prior art, the mode filter according to the invention is designed in such a manner that the fiber (1) has, in a transition region (4) between core (2) and cladding (3), at least one local refractive index modification region (5) which is arranged in the radially outer region of the core (2) and extends into the region of the cladding (3).
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